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Mr. Robert Cochran <br />Chevron Environmental Management Company _ 2 12 August 2003 <br />shut down the S VE system, due to asymptotic levels of treated contaminants and lack of rebo <br />SVE system shutdown. and after <br />2) I recommend that Chevron conduct computer mo <br />groundwater, to determine the pumping rate necessary lto maintain hydring of the a remaining <br />oontrol aant mass t soil and <br />City of Lodi Municipal Well #12 (Well #12), 420 feet southwest of extraction well EX- protect <br />should consider various pumping rates (including no pumping) and locations. If i 2. The modeling <br />modeling show no impact to Well #12, then the GWE system may also be shut down and groundwater <br />3) Groundwater monitoringwill con <br />tinue after During the GWE rebound test, all monitoring ells will GWE sbe sampled quarterly detertern shutdown, to n'ne !f rebound occurs. <br />t least one h <br />cycle (one year). If little or no rebound occurs, then Chevron may submit a site closure re ort. ydrologic <br />p <br />4) Quarterly groundwater monitoring is required by Regional Board Cleanup and Abatement Order <br />k No. 5-00-704. After the soil/groundwater modeling and GWE system rebound testCo <br />} been conducted and the report(s) have been reviewed by Regional Board staff, I recommend nt 2) have <br />reconsidering Chevron's request to reduce groundwater monitoring, or consider a request for No Further <br />Action Required at the site. <br />5) The California Registered Geologist listed on the signature <br />by the California Business and Professions Code. Submittal of are v ed si sign the Report, as required <br />California licensed professional engineer or geologist with license number/seal is necessary.ture page by a <br />r(7 necessary. <br />F1, <br />